Pass correct value as number of plurals

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/html/zen-units.html

@@ -19,7 +19,7 @@
 <td></td>
 <td colspan="2" class="translatetext">
 {% if not user.profile.hide_source_secondary or not item.secondary %}
-{% format_translation item.unit.source item.unit.translation.subproject.project.source_language search_match=search_query num_plurals=unit.translation.language.nplurals %}
+{% format_translation item.unit.source item.unit.translation.subproject.project.source_language search_match=search_query num_plurals=item.unit.translation.language.nplurals %}
 {% endif %}
 {% if item.secondary %}
 {% for unit in item.secondary %}